Dust-cap for tire-valves or the like.



H. P. KRAFT.

DUST CAP FOR TIRE VALVES OR THE LIKE.

APPLICATION FILED MAY 18, 1911.

1,295,766. Patented Feb. 1919.

Fig.1. Fig/3..

iNVENTOR WITNESSES: f

nanny r. new, or nrncnwoon, NEW JERSEY.

DUST-CAP FOR TIRE-VALVES OR THE LIKE.

Specification of Letters Patent.

Patented Feb. 25, 1919.

Application filed May 18, 1917." Serial No. 169,384.

To all whom it may concern:

Be a ]mown' that I, Hem; P. mm, a

citizen of the United States of America, residing in Ridgewood, in thecounty of Bergen and State of New Jersey, haveinvented certain new anduseful Improvements in Dust-Caps for Tire-Valves or the like, of whichthe following is a specification.

This invention relates to dust caps for tire valves or the like, andaims to provide certain improvements therein.

The present invention is directed particularly to a dust cap for valveswhich are used in connection with wire wheels, wherein there is nowooden felly, the spokes of the wheel being connected directly tothe'metalfall) rim. In this type of rim it has been cususeinterchangeable valves .of different lengths with the result that withthe shorter valves there is, of course, much less projection inwardlybeyond the rim than with the larger valves. standard type of dust cap along screwing operation is .necessary which in the .case of the largersizes of valve becomes quite burdensome. According to the presentinvention I provide-a cap which may be applied tomary to bya shortscrewing operation and as easilywithlong valves as with short valves..To this end. I provide a telescopic cap, the closed section of which.is adapted to screw onto the end of the body ofthe shell asdistinguished from the nipple, and the 0 en section of which'is adaptedto be exten ed along the closed section and to frictionally grasp thebody of the valve shell to maintain it in position. v y

The invention also includes'othen features of improvement which-will behereinafter more fully described.

Referring to the drawings 'which illustrate-one form ofthe inventionFigure 1 is a view of the tire rim, partly in section, the valve shellbeing shown 1n elevation and the dust cap embodyin the present inventionshown in diametrica section.

Fig. 1 the valve shellextends inwardly be- In' 'either' case in thequired to apply of a stop the cap can Fig. 2 is an elevation showing thecap as yond .the rim a considerably greater distance than in Fig. 2, dueto the difference in 1 length of the two valves.

erably arranged within the sleeve section and 1s provided with aninternal screwthread H which engages the thread on the valve shell orcasing. The sleeve section G 'is adapted to telescope with the capsection and is preferably provided at itsinner end with a frictionalmeans adapted to slide along the exterior of the valve casing and holdits position by frictional engagement.

In the construction shown this isprovided by-forming the end of thesleeve section with a reduced portion I which is slotted to form springarms J. The screw-threaded exterior of the valve casing rovides asurface which is well adapted or a frictional engagement with thesleeve.

Preferably in order to reduce the cap to a minimum, the screw-threadedortion H is made short and is arranged wit in the cap section F at aconsiderable distance from the end K t reof. Between the end and thescrew-thread the diameter of. the cap section is enlarged so that -'itwill slip over the casing without requiring to be rotated. It ispreferable also that the cap section shallbe provided with a stop whichwill limit its onward movement upon the valve shell. The simplest formof stop is that shown in which the metal beyond the end of the thread Lprevents the further screwin on of the cap section. This is so arrangedt at the cap section will not interfere with the valve cap M. By the useonly be screwed on a few turns which enables it to be seated in positionwith-rapidity, and the stop also enables the cap section to be tightenedin place the rev so that it w1ll not work loose in use. In or- 1 the capsection always occupies a definite position with regard to the'outer endof the valve shell, irrespective of the length of the latter. When thisis adjusted in place the sleeve G is slid down until its end I con-' Thecap is hence tacts with the rim nut.

- securely held against loss by a screw-threaded connection while. atthe same time it is capable of expanding and contracting in length, andin any position forms an efficient dust-excluding casing for the valvestem.

While I have shown and described one vention.

What I claim is 1. A dust cap comprising a cap portion havin an internalscrew-thread, and an adjustab le telescopic portion held in place byfrictional engagement having means at its inner end for engaging a valveshell, said means being adapted to slide along the valve shell. I

. 2. A dust cap comprising a cap portion having an internalscrew-thread, and a telescopic portion having means at its inner end forengaging a valve shell, said means A and a contracted adapted to slideon said cap portion and held in place by frictional engagement.

4:. A dust cap comprising a cap portion having an internal screw-threadadapted to engage a valve shell, a stop for limiting the onward movementof said cap portion, and

a telescopic portion sliding on said cap portion, and havlng means forfrictionally engaging a valve shell.

5. A dust cap having a screw-threaded cap portion and a telescopingportion sliding on said cap portion, said telescoping portion havingsprin arms adapted tofrictionally engage a va ve shell.

6. A dust cap having a cap portion F having a'flange O and internalscrew-thread H, and a sleeve portion G having a flange P portion Iformed with spring arms. a

In witness whereof, I have hereunto signed my name.

' HENRY P. KRAFT.

